JP5454941B2 - Latch device and joinery - Google Patents

Description

  The present invention relates to a latch device and a fitting including the latch device.

2. Description of the Related Art Conventionally, a fitting in which an opening / closing body is attached to a frame body so as to be freely opened and closed between a closed position and an open position is provided with a latch device that regulates the opening movement of the opening / closing body in the closed position.
As disclosed in Patent Document 1, the latch device includes a latch main body attached to an opening / closing body (shoji) and a locked portion (rail) provided on the frame (upper frame). The latch has a latch, and the latch has a non-locking posture in which the locking portion is below the locked portion and the trigger portion faces the locked portion, and the locking portion is engaged with the locked portion. There has been proposed a latch device that stops and rotates the trigger portion over a locking posture below the locked portion.

In this latch device, when the opening / closing body is closed and moved with the latch being in the non-locking posture, the trigger portion comes into contact with the locked portion, the latch rotates toward the locking posture, and the latch in which the opening / closing body is in the closed position is It rotates to a locking posture, a locking part locks to a to-be-latched part, and it controls so that an opening / closing body may not move to an opening side with a small operating force.
When the opening / closing body in the closed position is opened and moved, the opening / closing body is moved to the opening side with a large operating force, so that the latch is rotated toward the non-locking posture and the opening / closing body is moved to the opening side.
When the open / close body moves to the open side, the latch is in the non-locking posture.

Japanese Patent No. 4191147

In the conventional latch device described above, as shown in FIG. 12, the latch 3 is attached to the inner case 2 provided in the outer case 1 so as to be movable up and down so as to rotate between the aforementioned non-locking posture and the locking posture. In the latch 3 in the non-locking posture, the trigger portion 4 can move below the locked portion 5 together with the inner case 2.
For this reason, when the opening and closing body 6 is closed and moved while the latch 3 is lowered in the posture shown in FIG. 12, the trigger portion 4 does not contact the locked portion 5 and the latch 3 remains in the non-locking posture. The trigger portion 4 of the latch 3 may be locked to the locked portion 5 when the opening / closing body 6 is in the closed position as shown in FIG.
In this state, when the opening / closing body 6 is opened and moved, the latch 3 does not rotate in contact with the outer case 1. To open and move the opening / closing body 6, the latch 3 is moved downward against the spring 7 together with the inner case 2. It has to move and the trigger part 4 has to be moved below the locked part 5.
Therefore, the operating force for moving the opening / closing body 6 to the open side is large, making it difficult to open the opening / closing body.

  The object of the present invention is that when the latch in the non-locking position is moved, the latch rotates to the locking position, and the latch moves to the closing side beyond the locked portion in the non-locking position. There is no latch device and joinery.

  The latch device of the present invention includes a latch main body provided on the opening / closing body and a locked portion provided on the frame, and the latch main body is locked to the locked portion so that the opening / closing body in the closed position is closed. A latch device for restricting opening movement, wherein the latch main body is rotatable in a locking posture and a non-locking posture, and is locked closer to the locked portion in an in-plane direction than the rotation center. And a latch having a contact portion closer to the opposite side of the locked portion in the in-plane direction than the rotation center, and the contact portion of the latch being in sliding contact with the locked portion A latch rotating member to which a force directed toward the portion is applied, and the latch rotates to a locking posture and a non-locking posture while the contact portion is in sliding contact with the surface of the latch rotating member. When is in the locked position, the locked part is locked to the locked part, The locking portion is separated from the locked portion, the trigger portion is opposed to the opening side surface of the locked portion in the opening and closing direction, and the surface of the latch rotating member on which the contact portion of the latch is in sliding contact has a reference position. When the contact portion is in contact with the closing direction closing side with respect to the reference position, a rotational force acting on the latch is applied to the latching posture, and when the contact portion is in contact with the opening direction opening side, the latch is not locked. When the latch in the non-locking posture moves in a direction away from the locked portion in the in-plane direction, the latch is rotated toward the locking posture to make contact. And the reference position on the surface of the latch rotating member is closer to the closed side in the opening and closing direction, and the reference position is directed to the locked portion provided to the latch rotating member when the contact portion of the latch contacts. By force, the latch There latch device and wherein the force toward the rotation center of the latch is positioned to act.

  The latch device of the present invention includes a latch main body provided on the opening / closing body and a locked portion provided on the frame, and the latch main body is locked to the locked portion so that the opening / closing body in the closed position is closed. A latch device for restricting opening movement, wherein the latch main body portion includes a main body member, a latch mounting member provided on the main body member so as to be movable in an in-plane direction approaching and separating from the locked portion, and A latch mounted on the latch mounting member so as to be rotatable in an opening / closing direction of the opening / closing body in an opening / closing direction and moving in an in-plane direction with respect to the main body member, and having a rotating protrusion. A latch spring, a first spring provided between the main body member and the latch attachment member, and a second spring provided between the latch attachment member and the latch rotation member. Nearer one side in the in-plane direction near the locked part than the center of rotation The latch part is spaced apart in the opening / closing direction so that the locking part is on the closing side in the opening / closing direction and the trigger part is on the opening side in the opening / closing direction, and the latch is engaged more than the center of rotation. There is a contact portion and first and second positioning portions on the other side in the in-plane direction opposite to the stop portion, and this latch is in contact with the surface of the rotating projection to rotate the latch. While rotating the member in the in-plane direction other direction against the second spring and rotating to the locking posture and the non-locking posture, the member is positioned in the non-locking posture by the first positioning portion and the rotation protrusion, When the latch is in the locking position, the locking part is locked to the locked part, and when the latch is in the non-locking position, the locking part is locked. The trigger portion is closer to the opening side in the opening / closing direction of the locked portion than the locking portion on the other side in the in-plane direction. Has a reference position, and when the contact portion is in contact with the closing direction closing side with the reference position as a boundary, a rotational force acting on the latch is applied to the latch, and the contact portion is in contact with the opening direction opening side. When the latch is in the in-plane direction and the other side of the latch is moved together with the latch mounting member, a rotational force toward the non-locking posture acts on the latch. The contact portion is in contact with the closing side in the opening / closing direction with respect to the reference position on the surface of the rotation protrusion, and the reference position is an in-plane acting on the latch rotating member when the contact portion of the latch contacts. The latch device is characterized in that a force directed toward the center of rotation of the latch is applied to the latch by a force directed toward one side in the direction.

  In the latch device of the present invention, the surface on which the contact portion of the latch rotating member is in sliding contact has an arc shape along the opening / closing direction of the opening / closing body, and a straight line connecting the center of the arc of the surface and the rotation center of the latch A position that intersects the surface can be set as a reference position.

  In the latch device of the present invention, the surface on which the contact portion of the latch rotating member is in sliding contact is a mountain shape having a slope on the closing side of the opening / closing body and a slope on the opening side, and is a straight line passing through the rotation center of the latch. Can be set as a reference position.

  In the latch device according to the present invention, the latch main body portion is provided at an upper portion of the opening / closing body, and the locked portion is provided to extend downward from an upper frame of the frame body. However, when the trigger part of the latch moves to a position below the lower end of the locked part, the contact part of the latch can be brought into contact with the closing side in the opening / closing direction with respect to the reference position.

The joinery of the present invention is a joinery in which an opening / closing body is attached to a frame body so as to be freely opened and closed,
The opening and closing member, mounting the latch body portion of the latch device according to any one of claims 1 to 5, in the frame, the locked portion of the latch device according to any one of claims 1 to 5 And having the latch device according to any one of claims 1 to 5,
When the opening / closing body is in the open position, the latch of the latch main body is in the non-locking posture. When the opening / closing body is closed and moved in this state, the trigger portion of the latch contacts the locked portion and rotates toward the locking posture. The fitting is characterized in that when the opening and closing body is in the closed position, the latch is in the locking posture and the locking portion is locked to the locked portion.

According to the latch device of the present invention, when the latch in the non-locking posture is moved, the contact portion of the latch contacts the closing side in the opening / closing direction with respect to the reference position, and the latch is forcibly rotated to the locking posture.
Therefore, the latch does not move to the closing side beyond the locked portion in the non-locking posture.

It is a front view of the folding door as joinery. It is the detailed sectional view which expanded the attachment part of the latch device of joinery. It is operation | movement explanatory drawing of a latch apparatus. It is explanatory drawing of the latching state of a latch apparatus. It is operation | movement explanatory drawing in which rotational force is provided to a latch. It is sectional drawing which shows other embodiment of a latch rotation member. It is operation | movement explanatory drawing of a latch apparatus. It is operation | movement explanatory drawing which pushed down the latch of the non-locking attitude | position. It is operation | movement explanatory drawing which pushed down the latch of the non-locking attitude | position. It is operation | movement explanatory drawing which pushed down the latch of the non-locking attitude | position. It is sectional drawing of the state which moved the closing body further from the closed state to the closed side. It is sectional drawing of the conventional latch apparatus. It is a trouble explanatory view of the conventional latch device.

As shown in FIG. 1, an opening / closing body 20 is attached to a frame body 10 so as to be freely opened and closed.
The joinery shown in FIG. 1 is a folding door for a bathroom, and a frame 10 is formed by connecting an upper frame 11, a lower frame 12, a left and right vertical frame 13, and a left and right vertical frame 14 in a rectangular shape.
The open / close body 20 has one left and right shoji 20a and the other left and right shoji 20b, and can freely bend a vertical saddle 21 on the center side of the left and right shoji 20a and a vertical hook 22 on the center side of the other left and right shoji 20b. It is connected.
The vertical rod 23 on the door butt side of one of the left and right shojis 20a is supported on the upper frame 11 and the lower frame 12 so as to be rotatable in the out-of-plane direction, and the vertical rod 24 on the door end side of the other left and right shoji 20b 11, and is slidably supported in the in-plane direction along the lower frame 12.

Then, by holding the handle 25, an operating force in the opening direction is applied to the other left and right shoji 20b, and the shoji 20b is pulled in a direction away from the frame 10 in the out-of-plane direction (bathroom side). The right and left other shoji 20b is bent at the connecting portion so as to protrude toward the bathroom, and the left and right shoji 20a is turned to the bathroom side around the vertical rod 23 on the door butt side. By sliding the vertical gutter 24 on the left and right sides in the in-plane direction along the upper frame 11 and the lower frame 12, both the shojis 20a and 20b are overlapped on the bathroom side which is one side in the out-of-plane direction. Move to the overhanging open position.
By holding the handle 25 from the above-mentioned state and applying an operating force in the closing direction to the other left and right shoji 20b, and pulling the shoji 20b toward the left and right other side in the in-plane direction, The shojis 20a and 20b move to the closed position shown in FIG.
The joinery of the present invention is not limited to a folding door, and may be a hinged door, a sliding door, an inner window, an outer window, an inner window, an outer window, or the like.
That is, the joinery of the present invention may be a joinery in which the opening / closing body 20 moves between the open position and the closed position.

A latch device 30 is attached across the vertical rod 21 and the upper frame 11 on the center side of the left and right shoji 20a.
The latch device 30 prevents both the shojis 20a and 20b from moving to the open side when both the shojis 20a and 20b are in the closed position so as to move to the open side even if the handle 25 is pulled with a predetermined operating force. Thus, the opening movement is restricted, and both the shojis 20a and 20b are moved to the opening side by pulling the handle 25 with an operation force larger than a predetermined operation force.
The latch device 30 may be attached across the center-side vertical gutter 21 and the lower frame 12, or may be attached across the other central-side vertical gutter 22 and the upper frame 11.

FIG. 2 is an enlarged detailed cross-sectional view of a portion of the fitting (folding door) to which the latch device 30 is attached. One shoji 20a (vertical fence 21) is shown in phantom lines, and the frame 10 (upper frame 11) is shown in solid lines. It is shown.
In FIG. 2, the opening / closing body 20 opens and closes in the out-of-plane direction (the left-right direction in FIG. 2), and one side in the out-of-plane direction is the closed side and the other side in the out-of-plane direction is the open side. One direction is defined as the opening / closing direction closing side, and the other side in the out-of-plane direction is defined as the opening / closing direction opening side. Further, the vertical direction in FIG. 2 is the in-plane direction.
As shown in FIG. 2, the latch device 30 is provided on the latch main body 30 a provided on the vertical rod 21 (that is, the opening / closing body 20) on the center side of the one shoji 20 a and the upper frame 11 (that is, the frame body 10). The latch body 30a and the latched portion 30b are opposed to each other in the vertical direction, which is the in-plane direction, in the closed state shown in FIG.

  As shown in FIG. 2, the inner side surface 15 in the in-plane direction of the upper frame 11 faces the opening / closing direction of the upper frame 11, and is the above-described locked portion 30 b in the middle of the opening / closing direction of the inner side surface 15. An upper rail 16 is continuously provided in the longitudinal direction, and a door closing portion 17 protruding downward from the inner side surface 15 is provided on the closing side (right side in FIG. 2) of the upper frame 11 in the opening / closing direction. An airtight member 18 is attached to the portion 17 so as to face the shojis 20a and 20b as the opening / closing body 20 toward the opening / closing direction opening side (left side in FIG. 2).

  The latch main body 30a includes a main body member for attaching the latch main body 30a to the vertical shaft 21, for example, an outer case 31, and a latch mounting member provided on the outer case 31 so as to be movable in an in-plane direction (vertical direction), For example, an inner case 32, a first spring 33 that moves the inner case 32 to one side (upward) in the in-plane direction approaching the locked portion 30b, and a locking posture toward the opening / closing direction of the inner case 32 And a latch 34 rotatably provided over the non-locking posture, a latch rotating member 35 movable in the in-plane direction with respect to the outer case 31, and the latch rotating member 35 as a locked portion 30b. A second spring 36 is provided that moves to one side (upward) in the in-plane direction to approach.

The outer case 31 has an inner case mounting hole 31b opened on one side surface 31a in the in-plane direction, and the inner case 32 is inserted into the hole 31b so as to be slidable in the in-plane direction.
A first spring 33 is provided between the in-plane direction other side part (lower part) 32 a of the inner case 32 and the in-plane direction other side part (lower part) 31 c of the outer case 31. The first spring 33 is a coil spring.

The latch 34 is attached to one side (upper side) in the in-plane direction of the inner case 32 so as to be rotatable in an out-of-plane direction by an axis 40 that is perpendicular to the opening / closing direction and directed in a horizontal direction.
The latch 34 has a locking portion 41 on the opening / closing direction closing side closer to the one side in the in-plane direction (upper side) than the shaft 40, and triggers on the opening / closing direction opening side closer to the one side in the in-plane direction than the shaft 40. A portion 42 that is closer to the in-plane direction than the shaft 40 of the latch 34 is substantially V-shaped or recessed with a locking portion 41 and a trigger portion 42.
The latch 34 has a first positioning portion, for example, a first recess 43 on the closing side close to the other side in the in-plane direction (downward) from the shaft 40 of the latch 34, and opens / closes closer to the other side in the in-plane direction than the shaft 40. A second positioning portion, for example, a second recess 44 is provided on the direction opening side.
A portion between the first concave portion 43 and the second concave portion 44 in the opening / closing direction of the latch 34 protrudes toward the other side in the in-plane direction to form a contact portion 45.

The latch rotation member 35 is supported by the inner case 32 so as to be movable in the in-plane direction. The latch rotation member 35 has a rotation protrusion 50 protruding toward one side in the in-plane direction.
The first protrusion 43 and the second recess 44 of the latch 43 are fitted to the rotation protrusion 50 so that the latch 43 is positioned and held in the above-described locking posture and the non-locking posture, and the latch 43 is locked. The contact portion 45 comes into contact with the surface 51 of the rotation protrusion 50 when the device is rotated to the non-locking posture.
For example, the surface 51 of the rotation protrusion 50 is an arcuate surface curved in the opening and closing direction, the first and second recesses 43 and 44 of the latch 43 are arcuate recesses, and the rotation protrusion 50 is the first and second recesses 43. , 44 are fitted together.
The contact portion 45 of the latch 43 has a pointed shape.

The latch 43 shown in FIG. 2 is in the non-locking posture, and the locking portion 41 is located on the other side (lower side) in the in-plane direction (lower side) than the other side surface (lower surface) 30b-1 in the in-plane direction of the locked portion 30b. The portion 42 faces the opening side surface 30b-2 of the locked portion 30b in the opening / closing direction.
The rotation protrusion 50 of the latch rotation member 35 fits into the first recess 43, and the second recess 44 is located on one side in the in-plane direction of the rotation protrusion 50 and on the opening / closing direction opening side.
At this time, the first spring 33 and the second spring 36 hold the inner case 32 and the latch rotating member 35 at the positions shown in FIG. 2 in a free length state (or a compressed state).

  When one of the shojis 20a is moved from the state shown in FIG. 2 to the closing direction closing side indicated by the arrow a, the trigger portion 42 of the latch 34 contacts the opening direction opening side surface 30b-2 of the locked portion 30b. Further, when one of the shojis 2a is moved to the closing side in the opening / closing direction, the latch 34 rotates in the direction of the arrow b about the shaft 40 as shown in FIG. 3, and the contact portion 45 of the latch 34 is brought into contact with the surface 51 of the rotating projection 50. Since it moves toward the closing direction closing side while making contact, the latch rotating member 35 moves (presses down) toward the other side in the in-plane direction against the second spring 36.

  Since the second spring 36 is compressed by the movement of the latch rotation member 35 as described above, the latch rotation member 35 is moved to one side in the in-plane direction (locked state) by the elastic restoring force of the second spring 36. A moving force toward the part 30b) is applied.

As shown in FIG. 3, the locking portion 41 of the latch 34 moves closer to the closing side in the opening / closing direction than the locked portion 30b, and the contact portion 45 is closer to the closing side than the reference position 51a on the surface 51 of the rotating projection 50. 4, the latch rotating member 35 forcibly rotates the latch 34 in the direction of the arrow b, and the latch 34 rotates to the locking position as shown in FIG. The open / close direction open side surface 41a of 41 contacts the open / close direction closed side surface 30b-3 of the locked portion 30b (or faces away), and the lock portion 41 locks to the locked portion 30b.
At the same time, the rotation protrusion 50 of the latch rotation member 35 is fitted into the second recess 44 of the latch 34, and the latch 34 is positioned and held in the locking posture.

The principle by which the latch 34 is rotated in the arrow b direction by the above-described latch rotating member 35 will be described.
Due to the aforementioned force F acting on the latch rotating member 35, the latch 34 receives a force in a direction perpendicular to a tangent line passing through a position where the contact portion 45 of the latch 34 contacts the surface 51 of the rotating protrusion 50.
The reference position 51a in the opening / closing direction on the surface 51 of the rotating protrusion 50 is defined as the rotation center 34a of the latch 34 and the center 51b of the arcuate surface 51 of the rotating protrusion 50 as shown in FIGS. This is the position where the connecting straight line A and the surface 51 intersect. That is, the tangent line B passing through the reference position 51a and the straight line A are orthogonal.

When the contact portion 45 of the latch 34 is in contact with the reference position 51a, a force toward the rotation center 34a is applied to the latch 34 by the force F described above, and therefore the latch 34 does not rotate.
As indicated by a solid line in FIG. 5, if the contact portion 45 of the latch 34 contacts the closing side in the opening / closing direction with respect to the reference position 51a, the force F acting on the latch rotating member 35 toward one side in the in-plane direction. Thus, the force acting on the latch 34 is closer to the closing direction in the opening / closing direction than the center of rotation 34a, so that the rotating force acts in the direction of the arrow b (opening direction in the opening / closing direction). It will turn toward the locking posture.

  As indicated by phantom lines in FIG. 5, if the contact portion 45 of the latch 34 contacts the opening side in the opening / closing direction with respect to the reference position 51a, the force F acting on the latch rotating member 35 acts on the latch 34. Since the force to be moved is closer to the opening side in the opening / closing direction than the rotation center 34a, the force acts on the latch 34 in the direction of arrow c (the closing side in the opening / closing direction), and the latch 34 is directed to the non-locking posture. Will rotate.

The above description is not limited to the arc shape of the surface 51 of the rotating protrusion 50, and the same applies to the case where the surface 51 has a mountain shape.
For example, as shown in FIG. 6, when the surface 51 is mountain-shaped with a first slope 51 d toward the opening / closing direction closing side and a second slope 51 e toward the opening / closing direction opening side with the apex 51 c as a boundary, the rotation of the latch 34 is performed. The reference position 51a is a position where the straight line C passing through the center 34a intersects the first inclined surface 51d at a right angle.

As indicated by the solid line in FIG. 6, when the contact portion 45 of the latch 43 is in contact with the reference position 51a on the surface 51 of the rotating projection 50 closer to the closing side in the opening / closing direction, the force F causes the latch 34 to be engaged as described above. , A rotational force acting in the direction of the arrow b acts, and the latch 34 rotates toward the locking posture.
When the contact portion 45 of the latch 43 is in contact with the reference position 51a on the surface 51 of the rotating projection 50 closer to the opening side in the opening / closing direction as shown by the phantom line in FIG. , A rotational force acting in the direction of the arrow c acts, and the latch 34 rotates toward the non-locking posture.
When the contact portion 45 of the latch 43 is in contact with the reference position 51a, the latch 34 does not rotate as described above.
In such a case, the first and second recesses 43 and 44 are V-shaped so that the rotating protrusion 50 is fitted.

  That is, the aforementioned reference position 51a on the surface 51 of the rotating protrusion 50 is latched by the force F directed to one side in the in-plane direction acting on the latch rotating member 35 when the contact portion 45 of the latch 34 contacts. In addition, a force toward the rotation center 34a of the latch 34 is applied.

In the state shown in FIG. 4, when one of the shojis 20a is moved to the opening / closing direction opening side indicated by the arrow d, the opening / closing direction opening side surface 41a of the locking portion 41 of the latch 34 is closed in the opening / closing direction side surface 30b-3 of the locked portion 30b. , The latch 34 rotates in the direction of the arrow c.
Then, the latching portion 41 of the latch 34 moves to the opening / closing direction opening side with respect to the latched portion 30 b, and the contact portion 45 of the latch 34 opens in the opening / closing direction with respect to the reference position 51 a on the surface 51 of the rotating protrusion 50. 2 is applied to the latch rotating member 35 by the force F acting on the latch rotating member 35, and the latch 34 rotates to the unlocking position shown in FIG. The portion 50 fits into the first recess 43 to position and hold the latch 34 in the non-locking posture.

  Therefore, since the operating force for moving one of the shojis 20a to the opening side from the state shown in FIG. 4 is large, the one shoji 20a is restricted from moving to the opening side with a small operating force at the closed position shown in FIG. can do.

Further, as shown in FIG. 7, when one of the shojis 20a is in the open position, the latch 34 may be in a locked posture for some reason.
When one of the shojis 20a is moved to the opening / closing direction closing side indicated by the arrow a in this state, the opening / closing direction closing side surface 41b of the latching portion 41 of the latch 34 contacts the opening / closing direction opening side surface 30b-2 of the latched portion 30b, The latch 34 moves to the other side in the in-plane direction (downward) while sliding along the open side surface 30b-2.

As a result, the latch 34 moves together with the inner case 32 against the first spring 33 in the in-plane direction, and the locking portion 41 opens and closes beyond the other side surface 30b-3 in the opening / closing direction of the locked portion 30b. It can move to the direction closing side.
Therefore, as shown in FIG. 4, the locking portion 41 is locked to the locked portion 30b, and one of the shojis 20a can be regulated and held so as not to move to the open side with a small operating force at the closed position.

  As shown in FIG. 2, when one of the shojis 20a is in the open position and the latch 34 is in the non-locking posture, the latch 34 is loaded with the force Fa toward the other side (downward) in the in-plane direction. When 20a is moved to the closing side in the opening / closing direction (closed movement), as shown in FIG. 8, the inner case 32 together with the latch 34 against the first spring 33 is latched against the outer case 31 by the force Fa. Since the closing side 41b of the stop portion 41) moves to the other side (downward) in the in-plane direction while contacting the opening edge 31d on the closing side of the outer case 31, the latch 34 rotates in the direction of the arrow c. To do.

As the latch 34 rotates in the direction of the arrow c, the contact portion 45 sequentially moves toward the closing side in the opening / closing direction while contacting the surface 51 of the rotation protrusion 50 of the latch rotation member 35, and the latch rotation member 35 is moved to the inner case 32. On the other hand, it moves to the other side (downward) in the in-plane direction against the second spring 36.
As a result, a force F directed to one side (upward) in the in-plane direction is generated in the latch rotating member 35.

As shown in FIG. 9, when the latch 34 moves together with the inner case 32 until the trigger portion 42 moves below the other side surface (lower surface) 30 b-1 in the in-plane direction of the locked portion 30 b, The contact position of the surface 51 of the rotary protrusion 50 of the contact portion 45 is closer to the closing direction in the opening / closing direction than the reference position 51 a on the surface 51.
As a result, a rotational force in the direction of the arrow c acts on the latch 34 by the above-described force F of the latch rotating member 35, and the latch 34 rotates to the locking posture as shown in FIG.
When one of the shojis 20a moves to the closed position and the load of the force Fa on the latch 34 is released in this state, the inner case 32 moves to one side in the in-plane direction together with the latch 34, as shown in FIG. The locking portion 41 of the latch 34 is locked to the locked portion 30b.

Thus, when one of the shojis 20a is in the open position and the latch 34 is in the non-locking posture, the latch 34 is moved to the other side (downward) in the in-plane direction for some reason. When the latch 34 is moved toward the closing direction in the opening / closing direction (closed movement), the latch 34 is rotated to the locking posture, and when one of the shojis 20a is in the closed position, the latch 34 moves to one side in the in-plane direction. The engaging portion 41 of the latch 34 in the stopped posture engages with the locked portion 30b.
Accordingly, the latch 34 does not move to the closed side beyond the locked portion 30b in the non-locking posture, and it is not difficult to open the one shoji 20a.

As shown in FIG. 2, the trigger portion 42 of the latch 34 has a substantially rectangular cross section having an opening / closing direction side surface 42a, an opening / closing direction opening side surface 42b, and an out-of-plane direction side surface (tip surface) 42c.
The width dimension of the trigger part 42 in the opening / closing direction is such that the trigger part 42 exceeds the locked part 30b when the shoji in the closing position shown in FIG. 4 further moves toward the closing side in the opening / closing direction. It does not move to the closing side in the opening / closing direction.

For example, in the closed state of the shoji shown in FIG. 4, when one of the shojis 20a is loaded with an impact force (a large force) toward the closing direction of the opening / closing direction, the one of the shojis 20a compresses and deforms the hermetic material 18 to the closing side of the opening / closing direction. Move towards.
Then, as shown in FIG. 11, when the airtight member 18 is moved to the maximum position where the airtight member 18 is maximally compressed and deformed, the trigger portion 42 does not cross the locked portion 30b, and the trigger portion 42 is aligned in the in-plane direction. The side surface (upper surface) 42c hits the other side surface (lower surface) 30b-1 in the in-plane direction of the locked portion 30b.

  When the aforementioned impact force disappears, one of the shojis 20a moves to the opening / closing direction opening side by the elastic restoring force of the airtight member 18, and the trigger part 42 of the latch 34 moves to the opening / closing direction opening side from the locked portion 30b. The locking portion 41 is locked to the locked portion 30b.

Therefore, when the shoji is closed and the locking portion 34b of the latch 34 is locked to the locked portion 30b, when the shoji is loaded with an impact force and moved to the closing side in the opening / closing direction, the trigger is activated. The portion 42 does not move beyond the locked portion 30b to the closing side in the opening / closing direction.
The arc-shaped surface 51 of the rotating protrusion 50 is not limited to a single arc, but may be an arc or an ellipse having a plurality of centers.

  DESCRIPTION OF SYMBOLS 10 ... Frame, 11 ... Upper frame, 20 ... Opening / closing body, 30 ... Latch device, 30a ... Latch main body part, 30b ... Locked part, 31 ... Outer case (main body member), 32 ... Inner case (latch attachment member) ), 33... First spring, 34... Latch, 35... Latch rotating member, 36... Second spring, 40. , 44 ... second recess (second positioning part), 45 ... contact part, 50 rotation protrusion, 51 ... surface (surface in sliding contact), 51a ... reference position.

Claims (6)

A latch device that includes a latch main body portion provided on the opening and closing body and a locked portion provided on the frame body, and restricts the opening movement of the opening and closing body in the closed position by the latch main body portion being locked to the locked portion. Because
The latch body is rotatable in a locking posture and a non-locking posture, has a locking portion and a trigger portion closer to the locked portion in the in-plane direction than the rotation center, and rotates. A latch having a contact portion on the opposite side to the locked portion in the in-plane direction from the center, and a latch rotating member to which a force toward the locked portion is applied by the sliding portion of the contact portion of the latch being in sliding contact And
The latch rotates in the locking position and the non-locking position while the contact portion is in sliding contact with the surface of the latch rotating member, and when the latch is in the locking position, the locking portion becomes the locked portion. When locked and in the non-locking posture, the locking part is separated from the locked part, and the trigger part is opposed to the opening side in the opening and closing direction of the locked part,
The surface of the latch rotating member on which the contact portion of the latch slides has a reference position, and when the contact portion is in contact with the closing side in the opening / closing direction with the reference position as a boundary, a rotational force acting on the latch acts on the latching posture. And when the contact portion is in contact with the opening side in the opening and closing direction, a rotational force toward the non-locking posture acts on the latch,
When the latch in the non-locking posture moves in a direction away from the locked portion in the in-plane direction, the latch rotates toward the locking posture, and the contact portion is a reference on the surface of the latch rotating member. Make contact with the closing side of the opening and closing direction rather than the position,
The reference position is a position at which a force toward the rotation center of the latch acts on the latch by a force toward the locked portion applied to the latch rotation member when the contact portion of the latch contacts. Latch device. A latch device that includes a latch main body portion provided on the opening and closing body and a locked portion provided on the frame body, and restricts the opening movement of the opening and closing body in the closed position by the latch main body portion being locked to the locked portion. Because
The latch main body includes a main body member, a latch mounting member provided on the main body member so as to be movable in an in-plane direction approaching and separating from the locked portion, and the latch mounting member in the opening / closing direction of the opening / closing body. A latch that is rotatably mounted between a stopping posture and a non-locking posture, a latch rotating member that moves in an in-plane direction with respect to the main body member, and that has a rotation protrusion, and the main body member and the latch A first spring provided between the mounting member and a second spring provided between the latch mounting member and the latch rotating member;
The latch has a locking portion and a trigger portion on one side in the in-plane direction closer to the locked portion than the center of rotation, and the locking portion is on the closing side in the opening and closing direction, and the trigger portion is opened and closed. Separate in the opening and closing direction so that it is on the opening side,
The latch has a contact portion and first and second positioning portions closer to the other side in the in-plane direction closer to the opposite side to the locked portion than the center of rotation.
The latch rotates in the locked position and the non-locked position while the contact portion slides on the surface of the rotating protrusion and moves the latch rotating member in the in-plane direction opposite to the second spring. At the same time, the first positioning portion and the rotating projection are positioned in the non-locking posture, and the second positioning portion and the rotating projection are positioned in the locking posture. When the latch is in the locking posture, the locking portion is covered. When locked to the locking portion and in the non-locking posture, the locking portion is closer to the other side in the in-plane direction than the locked portion, and the trigger portion is opposed to the opening / closing direction opening side surface of the locked portion,
The surface of the rotation protrusion has a reference position, and when the contact portion is in contact with the opening / closing direction closing side with the reference position as a boundary, a rotational force acting on the latch is applied to the latching position, and the opening / closing direction opening side When the contact portion is in contact with the latch, a rotational force toward the non-locking posture acts on the latch,
When the latch in the non-locking posture moves together with the latch mounting member in the in-plane direction, the latch rotates toward the locking posture, and the contact portion is more than the reference position on the surface of the rotating protrusion. Make contact with the closing side
The reference position is a position where a force directed toward the center of rotation of the latch acts on the latch by a force directed to one side in the in-plane direction acting on the latch rotating member when the contact portion of the latch contacts. Latch device characterized.   The surface with which the contact portion of the latch rotating member is slidably contacted has an arc shape along the opening / closing direction of the opening / closing body, and a position where a straight line connecting the center of the arc of the surface and the rotation center of the latch intersects the surface is a reference position. The latch device according to claim 1 or 2. The surface on which the contact portion of the latch rotating member is in sliding contact is a mountain shape having a slope on the closing side and a slope on the opening side of the opening and closing body,
The latch device according to claim 1 or 2, wherein a position where a straight line passing through the rotation center of the latch is orthogonal to the inclined surface on the closing side is a reference position. The latch main body is provided at an upper portion of the opening / closing body, and the locked portion is provided to extend downward from an upper frame of the frame,
The latch in the non-locking posture is configured such that when the trigger portion of the latch moves to a position below the lower end of the locked portion, the contact portion of the latch contacts the closing side in the opening / closing direction with respect to the reference position. Item 5. The latch device according to any one of Items 1 to 4. A fitting with an openable and closable opening / closing body attached to a frame,
Said opening and closing member, mounting the latch body portion of the latch device according to any one of claims 1 to 5, in the frame, the locked portion of the latch device according to any one of claims 1 to 5 And having the latch device according to any one of claims 1 to 5,
When the opening / closing body is in the open position, the latch of the latch main body is in the non-locking posture. When the opening / closing body is closed and moved in this state, the trigger portion of the latch contacts the locked portion and rotates toward the locking posture. The fitting is characterized in that, when the opening and closing body is in the closed position, the latch is in a locking posture and the locking portion is locked to the locked portion.

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